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SubjectRe: [PATCH v2 1/6] soc: qcom: rpmpd: Add a powerdomain driver to model corners
On 25 May 2018 at 12:01, Rajendra Nayak <rnayak@codeaurora.org> wrote:
> The powerdomains for corners just pass the performance state set by the
> consumers to the RPM (Remote Power manager) which then takes care
> of setting the appropriate voltage on the corresponding rails to
> meet the performance needs.
>
> We add all powerdomain data needed on msm8996 here. This driver can easily
> be extended by adding data for other qualcomm SoCs as well.
>
> Signed-off-by: Rajendra Nayak <rnayak@codeaurora.org>
> Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
> ---
> .../devicetree/bindings/power/qcom,rpmpd.txt | 55 ++++

Please split DT doc changes into separate patches, to simplify review.

> drivers/soc/qcom/Kconfig | 9 +
> drivers/soc/qcom/Makefile | 1 +
> drivers/soc/qcom/rpmpd.c | 299 ++++++++++++++++++
> 4 files changed, 364 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/power/qcom,rpmpd.txt
> create mode 100644 drivers/soc/qcom/rpmpd.c
>

[...]

> +++ b/drivers/soc/qcom/rpmpd.c
> @@ -0,0 +1,299 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright (c) 2017-2018, The Linux Foundation. All rights reserved.
> + */
> +
> +#include <linux/err.h>
> +#include <linux/export.h>
> +#include <linux/init.h>
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/mutex.h>
> +#include <linux/pm_domain.h>
> +#include <linux/mfd/qcom_rpm.h>
> +#include <linux/of.h>
> +#include <linux/of_device.h>
> +#include <linux/platform_device.h>
> +#include <linux/soc/qcom/smd-rpm.h>
> +
> +#include <dt-bindings/mfd/qcom-rpm.h>
> +
> +#define domain_to_rpmpd(domain) container_of(domain, struct rpmpd, pd)
> +
> +/* Resource types */
> +#define RPMPD_SMPA 0x61706d73
> +#define RPMPD_LDOA 0x616f646c
> +
> +/* Operation Keys */
> +#define KEY_CORNER 0x6e726f63 /* corn */
> +#define KEY_ENABLE 0x6e657773 /* swen */
> +#define KEY_FLOOR_CORNER 0x636676 /* vfc */
> +
> +#define DEFINE_RPMPD_CORN_SMPA(_platform, _name, _active, r_id) \
> + static struct rpmpd _platform##_##_active; \
> + static struct rpmpd _platform##_##_name = { \
> + .pd = { .name = #_name, }, \
> + .peer = &_platform##_##_active, \
> + .res_type = RPMPD_SMPA, \
> + .res_id = r_id, \
> + .key = KEY_CORNER, \
> + }; \
> + static struct rpmpd _platform##_##_active = { \
> + .pd = { .name = #_active, }, \
> + .peer = &_platform##_##_name, \
> + .active_only = true, \
> + .res_type = RPMPD_SMPA, \
> + .res_id = r_id, \
> + .key = KEY_CORNER, \
> + }
> +
> +#define DEFINE_RPMPD_CORN_LDOA(_platform, _name, r_id) \
> + static struct rpmpd _platform##_##_name = { \
> + .pd = { .name = #_name, }, \
> + .res_type = RPMPD_LDOA, \
> + .res_id = r_id, \
> + .key = KEY_CORNER, \
> + }
> +
> +#define DEFINE_RPMPD_VFC(_platform, _name, r_id, r_type) \
> + static struct rpmpd _platform##_##_name = { \
> + .pd = { .name = #_name, }, \
> + .res_type = r_type, \
> + .res_id = r_id, \
> + .key = KEY_FLOOR_CORNER, \
> + }
> +
> +#define DEFINE_RPMPD_VFC_SMPA(_platform, _name, r_id) \
> + DEFINE_RPMPD_VFC(_platform, _name, r_id, RPMPD_SMPA)
> +
> +#define DEFINE_RPMPD_VFC_LDOA(_platform, _name, r_id) \
> + DEFINE_RPMPD_VFC(_platform, _name, r_id, RPMPD_LDOA)
> +
> +struct rpmpd_req {
> + __le32 key;
> + __le32 nbytes;
> + __le32 value;
> +};
> +
> +struct rpmpd {
> + struct generic_pm_domain pd;
> + struct rpmpd *peer;
> + const bool active_only;
> + unsigned long corner;
> + bool enabled;
> + const char *res_name;
> + const int res_type;
> + const int res_id;
> + struct qcom_smd_rpm *rpm;
> + __le32 key;
> +};
> +
> +struct rpmpd_desc {
> + struct rpmpd **rpmpds;
> + size_t num_pds;
> +};
> +
> +static DEFINE_MUTEX(rpmpd_lock);
> +
> +/* msm8996 RPM powerdomains */
> +DEFINE_RPMPD_CORN_SMPA(msm8996, vddcx, vddcx_ao, 1);
> +DEFINE_RPMPD_CORN_SMPA(msm8996, vddmx, vddmx_ao, 2);
> +DEFINE_RPMPD_CORN_LDOA(msm8996, vddsscx, 26);
> +
> +DEFINE_RPMPD_VFC_SMPA(msm8996, vddcx_vfc, 1);
> +DEFINE_RPMPD_VFC_LDOA(msm8996, vddsscx_vfc, 26);
> +
> +static struct rpmpd *msm8996_rpmpds[] = {
> + [0] = &msm8996_vddcx,
> + [1] = &msm8996_vddcx_ao,
> + [2] = &msm8996_vddcx_vfc,
> + [3] = &msm8996_vddmx,
> + [4] = &msm8996_vddmx_ao,
> + [5] = &msm8996_vddsscx,
> + [6] = &msm8996_vddsscx_vfc,
> +};

It's not my call, but honestly the above all macros makes the code
less readable.

Anyway, I think you should convert to allocate these structs
dynamically from the heap (kzalloc/kcalloc), instead of statically as
above.

> +
> +static const struct rpmpd_desc msm8996_desc = {
> + .rpmpds = msm8996_rpmpds,
> + .num_pds = ARRAY_SIZE(msm8996_rpmpds),
> +};
> +
> +static const struct of_device_id rpmpd_match_table[] = {
> + { .compatible = "qcom,msm8996-rpmpd", .data = &msm8996_desc },
> + { }
> +};
> +MODULE_DEVICE_TABLE(of, rpmpd_match_table);

[...]

> +static int rpmpd_aggregate_corner(struct rpmpd *pd)
> +{

Isn't the aggregation of the performance states in genpd sufficient
for your case?

I guess this is SoC specific and needed anyways, but then could you
perhaps add a few comments about what goes on here?

> + int ret;
> + struct rpmpd *peer = pd->peer;
> + unsigned long active_corner, sleep_corner;
> + unsigned long this_corner = 0, this_sleep_corner = 0;
> + unsigned long peer_corner = 0, peer_sleep_corner = 0;
> +
> + to_active_sleep(pd, pd->corner, &this_corner, &this_sleep_corner);
> +
> + if (peer && peer->enabled)
> + to_active_sleep(peer, peer->corner, &peer_corner,
> + &peer_sleep_corner);
> +
> + active_corner = max(this_corner, peer_corner);
> +
> + ret = rpmpd_send_corner(pd, QCOM_RPM_ACTIVE_STATE, active_corner);
> + if (ret)
> + return ret;
> +
> + sleep_corner = max(this_sleep_corner, peer_sleep_corner);
> +
> + return rpmpd_send_corner(pd, QCOM_RPM_SLEEP_STATE, sleep_corner);
> +}

[...]

> +static int rpmpd_probe(struct platform_device *pdev)
> +{
> + int i;
> + size_t num;
> + struct genpd_onecell_data *data;
> + struct qcom_smd_rpm *rpm;
> + struct rpmpd **rpmpds;
> + const struct rpmpd_desc *desc;
> +
> + rpm = dev_get_drvdata(pdev->dev.parent);
> + if (!rpm) {
> + dev_err(&pdev->dev, "Unable to retrieve handle to RPM\n");
> + return -ENODEV;
> + }
> +
> + desc = of_device_get_match_data(&pdev->dev);
> + if (!desc)
> + return -EINVAL;
> +
> + rpmpds = desc->rpmpds;
> + num = desc->num_pds;
> +
> + data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
> + if (!data)
> + return -ENOMEM;
> +
> + data->domains = devm_kcalloc(&pdev->dev, num, sizeof(*data->domains),
> + GFP_KERNEL);
> + data->num_domains = num;
> +
> + for (i = 0; i < num; i++) {
> + if (!rpmpds[i])
> + continue;
> +
> + rpmpds[i]->rpm = rpm;
> + rpmpds[i]->pd.power_off = rpmpd_power_off;
> + rpmpds[i]->pd.power_on = rpmpd_power_on;
> + pm_genpd_init(&rpmpds[i]->pd, NULL, true);

Question: Is there no hierarchical topology of the PM domains. No
genpd subdomains?

> +
> + data->domains[i] = &rpmpds[i]->pd;
> + }
> +
> + return of_genpd_add_provider_onecell(pdev->dev.of_node, data);
> +}
> +
> +static int rpmpd_remove(struct platform_device *pdev)
> +{
> + of_genpd_del_provider(pdev->dev.of_node);
> + return 0;
> +}
> +
> +static struct platform_driver rpmpd_driver = {
> + .driver = {
> + .name = "qcom-rpmpd",
> + .of_match_table = rpmpd_match_table,
> + },
> + .probe = rpmpd_probe,
> + .remove = rpmpd_remove,
> +};
> +
> +static int __init rpmpd_init(void)
> +{
> + return platform_driver_register(&rpmpd_driver);
> +}
> +core_initcall(rpmpd_init);
> +
> +static void __exit rpmpd_exit(void)
> +{
> + platform_driver_unregister(&rpmpd_driver);
> +}
> +module_exit(rpmpd_exit);
> +
> +MODULE_DESCRIPTION("Qualcomm RPM Power Domain Driver");
> +MODULE_LICENSE("GPL v2");
> +MODULE_ALIAS("platform:qcom-rpmpd");
> --
> QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member
> of Code Aurora Forum, hosted by The Linux Foundation
>

Besides the minor things above, this looks good to me.

Kind regards
Uffe

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